KWYB is apparently the Butte ABC and Fox affiliate and they're broadcasting on 18.2.
I am aware of that Equity Broadcasting channels were on free to air so when Equity went bankrupt we knew where the stations went when they sold off the 50+ stations they owned
Max Media bought the 3 remaining Fox stations in Montana. But since the towers were analog only and no digital facilites even dreamed up, Max said screw it and put the Fox on their subchannel